tech

February 15, 2026

AI as Fast as Your Train of Thought

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AI as Fast as Your Train of Thought

TL;DR

  • OpenAI's Codex-Spark model is optimized for speed, generating ~1,000 tokens per second.
  • It runs on Cerebras hardware, marking OpenAI's first use of non-Nvidia processors.
  • Spark is less capable on complex reasoning tasks compared to models like GPT-5.3 Codex and Opus 4.6.
  • Its speed is beneficial for tasks where maintaining user flow is critical, such as brainstorming and rapid iteration.
  • The model's rapid output may require new UI solutions to manage the volume of information.
  • Spark is currently available to Pro subscribers in the Codex app and command line interface, with limited API access.

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